Não informado. (1963). Bulletin of statistics on world trade in engineering products. United Nations, Economic Commission for Europe.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of Statistics on World Trade in Engineering Products. New York: United Nations, Economic Commission for Europe, 1963.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of Statistics on World Trade in Engineering Products. United Nations, Economic Commission for Europe, 1963.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.